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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bea12fa48331ed10e918ea4f6b82277906dcb14159504fbac676bd845c68b49d' 
  AND token = 'WQ9Tli9dylez/rkbvYOJmDFWJuW7x+NlP8RZZy8/0WE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}